The heartbeat cycle starts when electric impulses are generated from:
Correct answer: C. SA Node
- A. AV Node
- B. SV Node
- C. SA Node
- D. PQ Node
Explanation
SA Node: This option is the correct answer. The SA (sinoatrial) node, also known as the natural pacemaker of the heart, is the initial site where electric impulses are generated to start the heartbeat cycle. The SA node is located in the right atrium of the heart and sends electrical signals that cause the atria to contract.
This question appeared on the UHS MDCAT 2015 paper, which you can sit online with every answer explained.
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